The Ogallala aquifer stretches from South Dakota all the way south to Texas and is the largest aquifer in the United States holding as much water as Lake Huron at 2.9 billion acre feet. The Ogallala single handedly turned the arid High Plains region of the midwest into a $20 billion a year agricultural powerhouse that produces one-fifth of the country’s wheat, corn and beef cattle. The problem is that the water in the Ogallala, like many aquifers in the world, is being pumped dry. In many places the aquifer is dropping a foot a year and in other places it has already run dry.